Water pump longevity ????

[78F350]

Originally Posted by Giller

???? Every 4 years regardless of mileage? Where do you get this from? That makes no sense. Yes, age plays a factor, but mileage = the useage and that's what wears it out. Hence why most change it when they would do the timing belt ( or in our case, around that 100 k mark). 4 years....man....

Here's one place where Jake R. says to change them every 3 years:
Water pump: plastic impeller or metal? - Page 2 - Rennlist Discussion Forums
Lots of discussion on our forum over the last couple years too.
Personally, I plan to change mine about every 3 years. In doing so, I feel fine about using a metal impeller pump and flushing out my Prestone coolant . Still, you can get Pierburg at a good price if you shop around.